Abstract
A simple, compact and reliable liquid nitrogen level monitor is described which uses fine copper wire for continuous monitoring of liquid nitrogen levels in a dewar. The monitor has an analogue meter and light emitting diodes as indicators. A level of resolution better than ± 10 mm has been achieved. Sensor construction and the sensing electronic circuit are presented. The monitor incorporates an automatic liquid nitrogen refill system and remote shut-down of high voltage bias supply to the detector. Also built into the system is an alarm which sounds when the liquid nitrogen level is unacceptably low or the supply is exhausted.
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